LM2678S-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2678S-ADJ is a SIMPLE SWITCHER high-efficiency 5A step-down voltage regulator from Texas Instruments. It operates with an input voltage range of 8V to 40V and provides an adjustable output voltage between 1.21V and 37V. The device features a fixed switching frequency of 260kHz, allowing for the use of small inductors and capacitors. It is housed in a TO-263 (DDPAK) package with seven leads. The operational junction temperature range extends from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power switch eliminates the need for external components
• Fixed 260kHz switching frequency enables compact passive component selection
• Internal frequency compensation simplifies design implementation
• Thermal shutdown protection safeguards against overheating

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for embedded systems
• Battery-powered equipment requiring efficient step-down conversion
• Industrial control systems operating within wide input voltage ranges
• Telecommunications infrastructure power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix designation carefully, as the LM2678S-ADJ may be discontinued or replaced by variants such as the LM2678S-ADJ/NOPB. Confirm lead times and availability status directly with authorized distributors, as end-of-life notifications may affect long-term supply stability. Ensure the ordering part number matches the required package and pin configuration for your PCB layout.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust 5A buck converter is needed with minimal external circuitry. The adjustable output allows flexibility for various load requirements within the specified voltage limits. Consider the thermal performance of the TO-263 package under maximum load conditions. Verify that the 260kHz frequency aligns with electromagnetic interference constraints and inductor size requirements for the target application.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2678 family of SIMPLE SWITCHER regulators, designed for high-efficiency DC-DC conversion. The family includes fixed-output versions and other packages like the TO-220 variant. The LM2678S-ADJ specifically targets applications requiring adjustable output voltages with high current capability in a surface-mount format suitable for industrial and commercial environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2678S-ADJ/NOPB serves as a direct replacement, offering identical electrical characteristics with RoHS-compliant manufacturing. Verify pin compatibility and thermal pad connections when substituting. Other family members like the LM2679 series offer similar functionality but may differ in input voltage ranges or efficiency profiles.